Seasonal dynamics of mineral N pools and N-mineralization in soils under homegarden trees in South Andaman, India

Pandey, C. B.; Bahal, Ram; Singh, L. B.

doi:10.1007/s10457-007-9073-6

Cited by 19 publications

(14 citation statements)

References 33 publications

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“…; 350 m asl). The terrain was undulating and soils were Entisols (Dystric fluvisols, FAO), characterized with gravelysandy-loam texture and well drained nature (Pandey et al 2007a). Climate was equatorial humid tropical with mean monthly maximum and minimum temperatures varying from 29 to 32°C and 22 to 24°C, respectively.…”

Section: Study Areamentioning

confidence: 99%

“…Facilitative effects of trees on grass growth and yield occur when soil moisture and nutrients are growth-limiting in open pastures (Callaway and Walker 1997;Anderson et al 2001), particularly when soil moisture is a primary limiting factor (Ludwig et al 2004). Such conditions occur generally in arid, semi-arid (Belsky 1994;Ludwig et al 2004) and mediterranean (Gea-Izquierdo et al 2009;Koukoura et al 2009) climates, and also in sub-humid and humid climates particularly during the dry season (Pandey et al 2007a;Pandey and Singh 2009). Under such conditions, trees reduce evaporative losses by moderating temperature (both soil and air) (Belsky et al 1989;Belsky 1994;Baumeister and Callaway 2006;Guevara-Escobar et al 2007;Pandey et al 2010), and make soil moisture relatively greater (Belsky et al 1989;Cruz et al 1993;Belsky 1994).…”

Section: Introductionmentioning

confidence: 95%

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Forage production and nitrogen nutrition in three grasses under coconut tree shades in the humid-tropics

et al. 2011

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Reduction in forage production (FP) under trees in the humid tropics is well known, but information on how different levels of nitrogen (N) fertilizer influence FP under trees is meager. The present study reports effects of four N fertilizer levels (0, 60, 80 and 120 kg ha -1 N) on net soil N mineralization rate (NMR) and soil moisture (SM), FP, shoot biomass/root biomass ratio (SB/RB), N concentration in SB, N uptake and nitrogen use efficiency (NUE) of three grasses [guinea (Panicum maximum Jacq.), para (Brachiaria mutica (Forssk) Stapf) and hybrid-napier (Pennisetum purpureum Schumach.)] under three canopy positions [under canopy (UC, representing high shade), between canopy (BC, representing low shade) and open] of coconut trees (Cocos nucifera L.) in a coconut based silvopastoral system in the humid tropical climate of South Andaman Island of India. The study was performed for two annual cycles (2005-2006 and 2006-2007). The hypotheses tested were: (1) FP would decline under tree shades, both in N fertilized as well as no N fertilized conditions, when SM was not growth limiting in the open. However, amount of decline in the FP would depend on grass species and intensity of shades i.e., higher was the shade greater would be the decline; (2) N fertilizer would increase FP under tree shades, but the increase depended on grass species, intensity of shades and amount of N applied. Amount of N applied, however, would not annul the shades effects when SM was not growth limiting in the open. The study revealed that the tree reduced light 59% under UC and 32% under BC positions, but the N fertilizer levels increased NMR by 11-51% under UC and 3-44% under BC positions compared to the open. SM did not differ across the canopy positions. Under all situations, FP of all grasses declined under UC (47-78%) and BC (18-32%) positions compared to the open; the decline was greater in Hybrid-napier than Guinea and Para grasses. Forage production of all grasses increased with N fertilizer increments under all canopy positions reaching 32 t ha -1 dry matters for hybrid-napier at 120 kg ha -1 N in the open. Both guinea and para grasses outyielded hybrid-napier grass under UC but not under BC or in the open. N concentration in the forage (SB) also increased as N fertilizer level increased. These observations support our hypotheses and suggest that forage production under coconut palms can be increased by the application of N fertilizer with both guinea and para grasses being more productive than hybrid-napier grass under the high shade. Where light conditions are better, hybridnapier would produce more forage than the other species.

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Section: Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Forage production and nitrogen nutrition in three grasses under coconut tree shades in the humid-tropics

et al. 2011

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“…Soil N mineralization exhibited spatial and temporal variations, especially seasonal variations [14,[27][28][29]. However, it was not clear whether and how the rate of N mineralization in soil is related to the growing periods of trees above-ground.…”

Section: Dynamics Of Inorganic N and N Mineralizationmentioning

confidence: 99%

Influence of Tree Spacing on Soil Nitrogen Mineralization and Availability in Hybrid Poplar Plantations

Yafei

Fang

Tian

et al. 2015

Forests

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Nitrogen (N) availability and mineralization are key parameters and transformation processes that impact plant growth and forest productivity. We hypothesized that suitable plantation spacing can lead to enhanced soil N mineralization and nitrification, which in turn promote tree growth. Studies were conducted to evaluate seasonal patterns of soil inorganic N pools as well as rates of nitrification and N mineralization of three soil layers under four tree spacing treatments. Results showed tree spacing significantly affected annual net N mineralization, whereas inorganic N content in surface soils was significantly affected by tree spacing only during the growing season. The total annual cumulative net N mineralization ranged from 80.3-136.0 mg·kg −1 in the surface soils (0-20 cm), whereas the cumulative net N mineralization of 6 × 6 m and 4.5 × 8 m spacings was 65% and 24% higher than that of the 5 × 5 m, respectively. In general, tree spacing would affect N availability in soil by altering N mineralization rates, while high annual N mineralization was found in soils of low density plantations, with higher rates in square spacing than rectangular spacing. The obtained results suggest that suitable spacing could lead to enhanced N mineralization, but seasonal variation of soil N mineralization may not only be directly related to plantation productivity but also to understory vegetation productivity. OPEN ACCESSForests 2015, 6 637

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“…Others researchers reported: Soils in the Sahel are inherently fragile, low in carbon and poor in plants nutrients [24,27] . Knowledge of soil N dynamics is essential for effective crop management and fertilizer recommendations, Nitrogen mineralization and nitrification are usually very slow in the field during the dry season, but dramatically increase once the rains commence [26,27] .…”

Section: Discussionmentioning

confidence: 99%

“…Knowledge of soil N dynamics is essential for effective crop management and fertilizer recommendations, Nitrogen mineralization and nitrification are usually very slow in the field during the dry season, but dramatically increase once the rains commence [26,27] . Following rewetting of dried soil, N is often rapidly mineralized during the first 1-2 weeks and approaches steady-state conditions thereafter [11,12,24] . The wetting and drying of soil is the essential cause of the N flush.…”

Section: Discussionmentioning

confidence: 99%

Simulation Planning for Sustainable Use of Land Resources: Case study in Diamou

Yacouba¹,

Hu²,

Abdulahi³

2009

Journal of Mathematics and Statistics

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Abstract:In this study, we presented the simulation planning scheme to project land and land resources use changes at a local scale for Diamou (MALI). Problem statement: All the land cover types were under the influence of human and livestock population. Diamou has undergone changes in land-cover over the last decades. The shifting cultivation system practiced was probably the main reason for this state of affairs. Moreover, the dryness and extensive character of pastoral activities had contributed to the general degradation of natural resources. The principal objective of our study was to contribute to the sustainable use of land resources from 1999-2010. Approach: Using formula the resources supply and demand had been estimated based on statistics data, derived from a comprehensive review of the literature. The resources balance (difference between supply and demand) had been estimated for two years 1999 and 2010.The resources demand were measured by an average consumption needs person −1 day −1 multiplied by the population. For the livestock population the biomass demand and supply had been measured based on TLU dietary requirements and the pastureland carrying capacity. The diagram of resources balances were drawn using word Microsoft word command and the simulation land use areas schema using ArcGIS. Results: From present approach, it was found, that, in year 1999 the fuel wood and cereal balances were negative. The drink water and biomass balances were positive. The dominant land use categories were the pastureland and the cropland, occupying about 52 and 45% of total area respectively of the total area 8876 ha. Except the biomass balance in year 2010, all the resources balance were negative. The drink water and fuel wood deficits were equal to 439 and 2801 m³ respectively. The dominant land use class, a cropland covered approximately 45% of total area. Conclusion: Studies had indicated the cereal, fuel wood and drink water resources deficit in years 1999 and 2010.

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Seasonal dynamics of mineral N pools and N-mineralization in soils under homegarden trees in South Andaman, India

Cited by 19 publications

References 33 publications

Forage production and nitrogen nutrition in three grasses under coconut tree shades in the humid-tropics

Forage production and nitrogen nutrition in three grasses under coconut tree shades in the humid-tropics

Influence of Tree Spacing on Soil Nitrogen Mineralization and Availability in Hybrid Poplar Plantations

Simulation Planning for Sustainable Use of Land Resources: Case study in Diamou

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